Fill the 6×6 grid so every row and column contains all 6 symbols exactly once. Tap a cell to cycle through symbols.
Clues sit between adjacent cells:
No clue means unknown — it does not mean "different."
You have 1 check. The board must be fully filled before you can check.
Triangles are new — this is the hard mode. 6×6 is much deeper than 4×4.